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Recorded Investment with Respect to Impaired loans, Associated Allowance by Applicable Portfolio Segment and Principal Balance of Impaired Loans prior to Amounts Charged-off (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Impaired loans $ 50,403 $ 67,575
Allowance 3,746 7,791
Unpaid principal balance in total impaired loans 69,265 82,600
Non Accrual Loans
    
Impaired loans 29,515 40,467
Restructuring | Accrual Loans
    
Impaired loans 9,277 6,881
Restructuring | Non Accrual Loans
    
Impaired loans 11,611 20,227
Commercial Loan
    
Impaired loans 8,420 9,092
Allowance 2,123 1,037
Unpaid principal balance in total impaired loans 12,066 11,303
Commercial Loan | Non Accrual Loans
    
Impaired loans 3,842 4,526
Commercial Loan | Restructuring | Accrual Loans
    
Impaired loans 3,501 1,866
Commercial Loan | Restructuring | Non Accrual Loans
    
Impaired loans 1,077 2,700
All Other
    
Impaired loans 5,423 7,402
Allowance 891 1,595
All Other | Non Accrual Loans
    
Impaired loans   1,893
All Other | Restructuring | Accrual Loans
    
Impaired loans 4,261 4,308
All Other | Restructuring | Non Accrual Loans
    
Impaired loans 1,162 1,201
Impaired Financing Receivables with Related Allowance
    
Impaired loans 15,833 36,742
Impaired Financing Receivables with Related Allowance | Non Accrual Loans
    
Impaired loans 6,660 20,106
Impaired Financing Receivables with Related Allowance | Restructuring | Accrual Loans
    
Impaired loans 7,347 5,528
Impaired Financing Receivables with Related Allowance | Restructuring | Non Accrual Loans
    
Impaired loans 1,826 11,108
Impaired Financing Receivables with Related Allowance | Commercial Loan
    
Impaired loans 5,038 2,763
Impaired Financing Receivables with Related Allowance | Commercial Loan | Non Accrual Loans
    
Impaired loans 2,226 1,110
Impaired Financing Receivables with Related Allowance | Commercial Loan | Restructuring | Accrual Loans
    
Impaired loans 2,591 1,346
Impaired Financing Receivables with Related Allowance | Commercial Loan | Restructuring | Non Accrual Loans
    
Impaired loans 221 307
Impaired Financing Receivables with Related Allowance | All Other
    
Impaired loans 3,816 4,955
Impaired Financing Receivables with Related Allowance | All Other | Non Accrual Loans
    
Impaired loans   1,093
Impaired Financing Receivables with Related Allowance | All Other | Restructuring | Accrual Loans
    
Impaired loans 3,441 3,475
Impaired Financing Receivables with Related Allowance | All Other | Restructuring | Non Accrual Loans
    
Impaired loans 375 387
Impaired Financing Receivables with No Related Allowance
    
Impaired loans 34,570 30,833
Impaired Financing Receivables with No Related Allowance | Non Accrual Loans
    
Impaired loans 22,855 20,361
Impaired Financing Receivables with No Related Allowance | Restructuring | Accrual Loans
    
Impaired loans 1,930 1,353
Impaired Financing Receivables with No Related Allowance | Restructuring | Non Accrual Loans
    
Impaired loans 9,785 9,119
Impaired Financing Receivables with No Related Allowance | Commercial Loan
    
Impaired loans 3,382 6,329
Impaired Financing Receivables with No Related Allowance | Commercial Loan | Non Accrual Loans
    
Impaired loans 1,616 3,416
Impaired Financing Receivables with No Related Allowance | Commercial Loan | Restructuring | Accrual Loans
    
Impaired loans 2,591 520
Impaired Financing Receivables with No Related Allowance | Commercial Loan | Restructuring | Non Accrual Loans
    
Impaired loans 856 2,393
Impaired Financing Receivables with No Related Allowance | All Other
    
Impaired loans 1,607 2,447
Impaired Financing Receivables with No Related Allowance | All Other | Non Accrual Loans
    
Impaired loans   800
Impaired Financing Receivables with No Related Allowance | All Other | Restructuring | Accrual Loans
    
Impaired loans 820 833
Impaired Financing Receivables with No Related Allowance | All Other | Restructuring | Non Accrual Loans
    
Impaired loans   814
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
    
Impaired loans 8,957 18,701
Allowance   7
Unpaid principal balance in total impaired loans 22,803 37,442
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Non Accrual Loans
    
Impaired loans 3,950 7,798
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Restructuring | Non Accrual Loans
    
Impaired loans 5,007 10,903
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
    
Impaired loans 12,345 16,964
Allowance 112 3,380
Unpaid principal balance in total impaired loans 16,321 17,389
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Non Accrual Loans
    
Impaired loans 11,187 15,695
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans 1,158 1,269
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
    
Impaired loans 15,258 15,416
Allowance 620 1,772
Unpaid principal balance in total impaired loans 18,075 16,466
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Non Accrual Loans
    
Impaired loans 10,536 10,555
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Accrual Loans
    
Impaired loans 1,515 707
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans 3,207 4,154
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Acquisition, Development and Construction
    
Impaired loans   6,504
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Acquisition, Development and Construction | Restructuring | Non Accrual Loans
    
Impaired loans   6,504
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Investor Real Estate
    
Impaired loans 356 14,440
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Investor Real Estate | Non Accrual Loans
    
Impaired loans 180 13,812
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Investor Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans 176 628
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Owner Occupied Real Estate
    
Impaired loans 6,623 8,080
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Owner Occupied Real Estate | Non Accrual Loans
    
Impaired loans 4,254 4,091
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with Related Allowance | Commercial Owner Occupied Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans 1,054 3,282
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Acquisition, Development and Construction
    
Impaired loans 8,957 12,197
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Acquisition, Development and Construction | Non Accrual Loans
    
Impaired loans 3,950 7,798
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Acquisition, Development and Construction | Restructuring | Non Accrual Loans
    
Impaired loans 982 4,399
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Investor Real Estate
    
Impaired loans 11,989 2,524
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Investor Real Estate | Non Accrual Loans
    
Impaired loans 11,007 1,883
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Investor Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans 982 641
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Owner Occupied Real Estate
    
Impaired loans 8,635 7,336
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Owner Occupied Real Estate | Non Accrual Loans
    
Impaired loans 6,282 6,464
Commercial Real Estate Portfolio Segment | Impaired Financing Receivables with No Related Allowance | Commercial Owner Occupied Real Estate | Restructuring | Non Accrual Loans
    
Impaired loans $ 2,153 $ 872